Thomas Aquinas
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“Precisely because of this "truth" the natural law involves universality. Inasmuch as it is inscribed in the rational nature of the person, it makes itself felt to all beings endowed with reason and living in history. In order to perfect himself in his specific order, the person must do good and avoid evil, be concerned for the transmission and preservation of life, refine and develop the riches of the material world, cultivate social life, seek truth, practice good and contemplate beauty”. (Veritatis Splendor paragraph 51)Hence it is that human nature, in so far as it comes in contact with the angelic nature, must both in speculative and practical matters know truth without investigation. And this knowledge must be the principle of all the knowledge which follows, whether speculative or practical, since principles must be more stable and certain. Therefore, this knowledge must be in man naturally, since it is a kind of seed plot containing in germ all the knowledge which follows, and since there pre-exist in all natures certain natural seeds of the activities and effects which follow. Furthermore, this knowledge must be habitual so that it will be ready for use when needed. Thus, just as there is a natural habit of the human soul through which it knows principles of the speculative sciences, which we call understanding of principles, so, too, there is in the soul a natural habit of first principles of action, which are the universal principles of the natural law.
This habit pertains to synderesis. This habit exists in no other power than reason, unless, perhaps, we make understanding a power distinct from reason. Synderesis does not denote higher or lower reason, but something that refers commonly to both. For in the very habit of the universal principles of law there are contained certain things which pertain to the eternal norms of conduct, such as, that God must be obeyed; and there are some that pertain to lower norms, such as, that we must live according to reason.
Source: Thomas Aquinas Summa Theologica